Abstract
A detailed investigation on the crystalline structure of AISI M2 steel by using copper alloy electrode in electric discharge machining (EDM) process has been done. Also, material removal rate (MRR), electrode wear rate (EWR) and surface roughness (SR) of the steel material on the basis of three variable input process parameters were analyzed followed by analysis of variance (ANOVA), regression analysis and different characterization techniques. In X-ray diffraction (XRD) study, it has been observed that the peak has been broadened and shifted with the formation of new nano crystalline phases. Lowest surface roughness of 1.19±0.9μm and 9.25±0.5nm was observed through optical surface profiler (OSP) and atomic force microscopy (AFM), respectively. Higher MRR of 0.015276mg/min and minimum EWR of 0.014113mg/min were observed for sample having the same input parameters as current 7A, pulse on time 45μs and spark gap of 5μm.
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